Weegy: Here's the global effects Genetics. Some people are born with faster metabolisms; some with slower metabolisms.
Gender. Men have a greater muscle mass and a lower body fat percentage. This means they have a higher basal metabolic rate.
Age. [ [ BMR reduces with age. After 20 years, it drops about 2 per cent, per decade.
Weight. The heavier your weight, the higher your BMR. Example: the metabolic rate of obese women is 25 percent ... (More)